Question

You transform 700 J of potential energy into kinetic energy to pull a wagon. If it took you 20 s to move the wagon, what was your power?

Answer 1

The power is the work done W divided by the time t:

`P= (W)/(t)`
In our problem, the work done corresponds to the potential energy converted into kinetic energy of motion of the wagon, so W=700 J, while the time is t=20 s, so the power is:

`P= (700 J)/(20 s) =35 W`